Kinetic study of thermophilic aerobic stabilization of sludge

Hawash, S.; Ibiari, N. El; Aly, F.H.; Diwani, G. El; Hamad, Abdullah

doi:10.1016/0961-9534(94)90068-x

Cited by 18 publications

(7 citation statements)

References 2 publications

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“…[ 9,28 ] Solvent extraction, or so‐called liquid–liquid extraction, is a method where the components of a liquid mixture are extracted by treatment with a solvent in which one or more of the desired components are ideally soluble. [ 33 ]…”

Section: Introductionmentioning

confidence: 99%

Selective recovery of lithium from Dead Sea end brines using UBK10 ion exchange resin

2022

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The Dead Sea, a live pool of minerals and elements, holds ~9% of the world's known lithium reserves. However, the low lithium concentrations (30-40 mg/L) in the end brine and the high divalent to lithium ratio (Mg +2 + Ca +2 to Li + ) were obstacles that must be overcome to extract the lithium. In our previous work, lithium concentrations in the Dead Sea end brine were enriched by chemical precipitation up to 1700 mg/kg in the produced solid precipitate. The obtained precipitate was decomposed by doubledistilled water, and about 66% of lithium was leached, producing an environmental liquor containing an elevated concentration of lithium. A sequential ion exchange technique was used to achieve selective lithium recovery in this study. The ability of the UBK 10 strong acid-type cation exchange resin (Na type) to remove lithium from simulated and environmental lithiumbearing solutions was investigated. Because of the complex matrix comprising components that may compete with lithium adsorption, a greater quantity of adsorbent was required to achieve the equilibrium state for the environmental solution (7 g) compared to (3.6 g) for the simulated solution.For both lithium-bearing solutions, the kinetics investigation revealed a pseudo-second-order tendency. The interfering capacity was determined to be 0.405, confirming the UBK 10 challenge to selective lithium adsorption.The divalent to lithium ratio was decreased by more than 50 times, yielding encouraging findings for extracting lithium from the low lithium-high divalent to lithium sophisticated Dead Sea end brines.

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Section: Introductionmentioning

confidence: 99%

Selective recovery of lithium from Dead Sea end brines using UBK10 ion exchange resin

2022

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“…Relative to classical waste process such as activated sludge, TAD is a new process (Surucu et al. 1975), and its advantages include the capacity for rapid, cost‐effective waste stabilization (Hawash et al. 1994) and pasteurization (Ugwuanyi et al.…”

Section: Introductionmentioning

confidence: 99%

Diversity of thermophilic populations during thermophilic aerobic digestion of potato peel slurry

2007

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To study the diversity of thermophiles during thermophilic aerobic digestion (TAD) of agro-food waste slurries under conditions similar to full-scale processes. Population diversity and development in TAD were studied by standard microbiological techniques and the processes monitored by standard fermentation procedures. Facultative thermophiles were identified as Bacillus coagulans and B. licheniformis, while obligate thermophiles were identified as B. stearothermophilus. They developed rapidly to peaks of 107 to 108 in ≤48 h. Stability of obligate thermophiles increased with process temperatures. Thermophiles were unstable at process pH above or below neutral, but developed rapidly at all aeration rates. Peak populations were higher in the median than at extremes of aeration rates. Obligate thermophiles were unstable at low aeration rates. Process self-heating was higher at lower than at higher aeration rate. Beyond 96 h most thermophiles were present as spores. Limited range of indigenous thermophiles drives TAD of slurry. They develop rapidly and are stable at most digestion conditions. Development and stability of thermophiles in TAD suggest that the process may be operated in a wide range of conditions; and even at short HRT in continuous processes without compromising efficiency

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“…Constraints of modeling an aerobic thermophilic batch degradation process without respirometry are apparent from the work of Hawash (1994) . The change in VSS was used here as the measured model variable; this, however, is not applicable in the initial high‐rate period of the degradation.…”

Section: Introductionmentioning

confidence: 99%

Application of Activated Sludge Model No. 3 for the Modeling of Organic Matter Biodegradation at Thermophilic Temperatures

Kovács¹,

Csikor²,

Házi³

et al. 2007

Water Environment Research

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The primary aim of our research was to investigate the applicability of activated sludge models (ASM) for aerobic thermophilic processes, especially autothermal thermophilic aerobic digestion (ATAD). The ASM3 model (Gujer et al., 1999) theoretically seems to be the most suitable, because storage plays an important role in a batch-feed cycle system like ATAD. The ASM3 model was extended with an activation step of the thermophilic organisms. This model was calibrated and verified by independent test results, demonstrating its ability to describe the process. The growth (l H 5 26.04 day 21 ), storage (k STO 5 20.39 day 21 ), hydrolysis (k H 5 11.15 day 21 ) and decay rates (b H,O2 5 1.28 day 21 , b STO,O2 5 1.10 day 21 ) obtained from calibration are significantly higher at 558C than at mesophilic temperatures, justifying the faster metabolism at higher temperatures. An inert fraction of the biomass (characterized by the model parameter f I 5 0.4) was found to be significantly greater than in the mesophilic case. This can be attributed to the lower diversity of the thermophilic species and thus to their narrower substrate spectra. Water Environ. Res., 79, 554 (2007).

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Kinetic study of thermophilic aerobic stabilization of sludge

Cited by 18 publications

References 2 publications

Selective recovery of lithium from Dead Sea end brines using UBK10 ion exchange resin

Selective recovery of lithium from Dead Sea end brines using UBK10 ion exchange resin

Diversity of thermophilic populations during thermophilic aerobic digestion of potato peel slurry

Application of Activated Sludge Model No. 3 for the Modeling of Organic Matter Biodegradation at Thermophilic Temperatures

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